✨ Added crypto node docs

docs/nodes/nodes-library/core-nodes/Crypto/README.md

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+---
+permalink: /nodes/n8n-nodes-base.crypto
+---
+
+# Crypto
+
+The Crypto node is used to encrypt data in workflows.
+
+## Node Reference
+
+- Action
+	- Hash a text in a specified format
+	- Hmac a text in a specified format
+	- Sign a string using a private key
+
+You can configure further options for each action by selecting the type of encryption and encoding to be used, in the _Type_ and _Encoding_ fields respectively.
+
+- Type
+    - MD5
+    - SHA256
+    - SHA512
+
+- Encoding
+	- BASE64
+	- HEX
+
+## Example Usage
+
+This workflow allows you to encrypt data using the Crypto node. You can also find the [workflow](https://n8n.io/workflows/574) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Crypto]()
+
+
+The final workflow should look like the following image.
+
+![A workflow with the Crypto node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Crypto node
+
+1. Enter the data that you want to encrypt in the *Value* field.
+2. Click on *Execute Node* to run the workflow.